The granular indigo is processed by spray drying the slurry of acid washing indigo with additive, it has advantages of:

1. Free of dust or little flying dust. The granules have certain mechanical strength, and don't create dust easily, so it can improve the working environment and sanitary condition;

2. Good flowability, which is beneficial to the automatic measuring and operation;

3. Good wettability and dispersibility, don't agglomerate or aggregate in use, and is convenient for preparing dye liquor.

4. Good storage stability, and don't absorb moisture easily, and has not electrostatic adsorption phenomenon.

It can also ensure the homogenic color and brilliant color light in printing and dyeing.

Appearance

Homogenic dark blue powder

Colour light

Similar as the standard sample

Content

≥ 92.0%,93.0%

Moisture content

≤ 1.0%

Strength

Equal to 100 percent of the standard sample

PH value

9.5-10.5

Content of ferric ions

≤ 200PPM

Wetting power

≤10second